157821040 has 80 divisors (see below), whose sum is σ = 397349568. Its totient is φ = 57950208.

The previous prime is 157821007. The next prime is 157821043. The reversal of 157821040 is 40128751.

It is a tau number, because it is divible by the number of its divisors (80).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (157821043) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 273232 + ... + 273808.

Almost surely, 2^157821040 is an apocalyptic number.

157821040 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 157821040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (198674784).

157821040 is an abundant number, since it is smaller than the sum of its proper divisors (239528528).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

157821040 is a wasteful number, since it uses less digits than its factorization.

157821040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 866 (or 860 counting only the distinct ones).

The product of its (nonzero) digits is 2240, while the sum is 28.

The square root of 157821040 is about 12562.6844265069. The cubic root of 157821040 is about 540.4078309144.

Adding to 157821040 its reverse (40128751), we get a palindrome (197949791).

The spelling of 157821040 in words is "one hundred fifty-seven million, eight hundred twenty-one thousand, forty".